Topic: Re: hydraulic problems on david brown 990
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Still not sure on how your loader is plumbed, I have seen these set up so many different ways... Pictures would help.
Is the loader valve open or closed center? Has the system ever worked right?
The lever creeping back it probably just the friction brake on it. The lever all the way back is the "Select" position, normally there is spring to keep it from going all the way back unless you push it there. The relief valve will normally squeal once the arms are all the way up and valve in "select". "Select" allows the lift to go a hair higher than normal so that you can change the mode on the little 3 position lever from "height", to "depth", and "TCU" function.
The brake for the 3 point lever is adjusted by the 2 nuts on the side of the housing near your right heel. They take a 3/4" wrench. Loosen the jam nut, the snug the inner one till you are happy, then jam the out back down.
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